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Type: Journal article
Title: Effects of timing and intensity of elevated temperatures on reproductive development of field-grown Shiraz grapevines
Author: Pagay, V.
Collins, C.
Citation: Oeno One, 2017; 51(4):409-421
Publisher: Université de Bordeaux (Bordeaux, France)
Issue Date: 2017
ISSN: 2494-1271
Statement of
Vinay Pagay and Cassandra Collins
Abstract: Aim: To investigate whether timing and duration of exposure to elevated temperatures impact the reproductive development of field-grown Shiraz grapevines. Methods and results: The reproductive responses of Shiraz grapevines (Vitis vinifera L.) to two levels of elevated temperatures at budburst and flowering were investigated in an irrigated vineyard in the Barossa Valley (South Australia) over two consecutive growing seasons. Custom-built under-vine ‘tents’ and closed flow-through chambers enclosing a set of grapevines in the field were used to raise canopy temperatures above ambient. Higher temperatures at flowering resulted in lower yields due to decreased fruit set in 2007-08, while yield was virtually unaltered the following year despite the lower fruit set. Two indicators of grapevine reproductive performance, Coulure Index and Millerandage Index that quantify abscised and underdeveloped berries, respectively, were calculated to be higher as a result of the heat treatments in both seasons. Stigma receptivity, pollen germination, and pollen tube kinetics were generally lower in vines grown under the tents. Conclusion: Flowering and fruit set are strongly influenced by temperature changes during this period of development. Significance and impact of the study: This is one of the first field based studies to demonstrate that extreme temperatures (>35°C) during the flowering period detrimentally effect fruit set and final yield, thus providing critical knowledge for managing vineyards in a changing climate.
Keywords: Flowering; fruit set; climate change; heat stress; millerandage; coulure
Rights: ©Université de Bordeaux (Bordeaux, France)
RMID: 0030098393
DOI: 10.20870/oeno-one.2017.51.4.1066
Appears in Collections:Agriculture, Food and Wine publications

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